The ROHM is an evaluation board for BH1749NUC colour sensor. The input supply voltage is 3V. BH1749NUC is a digital colour sensor IC with an I2C bus interface. This IC senses Red, Green, Blue (RGB) and Infrared and converts them to digital values. The high sensitivity, wide dynamic range and excellent Ircut characteristics make it possible for this IC to obtain the accurate illuminance and colour temperature of ambient light.